I Kabalci

Harran University, Charan, Şanlıurfa, Turkey

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Publications (7)4.87 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Ternary tellurite based glasses in the (TeO2)(ZnO)(TiO2) system were prepared and its optical properties and crystallization kinetics investigated by using UV-VIS spectrophotometer and differential thermal analyzer (DTA). All the glasses were transparent from visible to near infrared region for different ZnO glass compositions (x=0.05, 0.10, 0.20, and 0.30 mol). In the experiment, optical band gap and Urbach energies were estimated from the optical absorption spectra between 400 and 800 nm wavelength region. The observed results confirm that the addition of ZnO glass composition from 0.05 to 0.30 mol increases the optical band gap energy from 2.94 to 3.0 eV. In addition, glass transition (Tg), crystallization (Tp) and melting temperature (Tm) were determined by using the DTA plots. Finally, DTA results obtained with a heating rate of 20°C/min show that the peak crystallization temperature increases from 463 to 533 °C as the ZnO content increases from 0.05 to 0.30 mol (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
    physica status solidi (c) 05/2011; 8(9):2629 - 2632.
  • Idris Kabalci, Turgay Tay, Gönül Özen
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    ABSTRACT: A type of thulium doped tellurite based optical glasses was prepared through conventional melt quenching technique. In the experiments, the effect of different Tm3+ ion concentration and glass composition on optical properties of (TeO2)(1-x-y)(Nb2O5)(x)(TiO2)(y) (x=0.05, 0.10, 0.15, and 0.20 mol) glasses have been investigated by using UV-VIS-NIR optical spectrophotometry measurements in a wavelength range 400-2000 nm. Considering absorption measurements for the 1.0mol% Tm3+ doped of (TeO2)0.9(Nb2O5)0.05(TiO2)0.05 glass, 1G4, 3F2, 3F3, 3F4, 3H5, and 3H4 absorption bands were observed from the 3H6 ground level, at 463, 660, 687, 793, 1211 and 1700 nm wavelengths, respectively. Furthermore, spontaneous emission probabilities, and the radiative lifetimes for the 4f-4f transitions of the Tm3+ ions were calculated. The spectral intensities were determined in terms of Judd-Ofelt parameters (Ω2, Ω4, Ω6). Luminescence analysis was realized for the different Tm3+ ion concentration (0.002, 0.005 and 0.01mol) at room temperature. The luminescence band intensity of the 3F4→3H4 transition was measured as a function of Tm3+ ion concentration (0.002, 0.005 and 0.01mol). Furthermore, luminescence data of the thulium doped glass samples were used to determine the compositional dependence of the emission cross sections at 1470 nm (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
    physica status solidi (c) 05/2011; 8(9):2625 - 2628.
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    ABSTRACT: We investigated the near-infrared luminescence characteristics as a function of glass composition and Tm3+ ion concentration in a new type of Tm3+-doped tellurite glass: (1−x)TeO2–(x)PbF2. In the experiments, absorption measurements were first performed to determine the spontaneous emission probabilities and the radiative lifetimes for the 4f–4f transitions of the Tm3+ ions by using the Judd–Ofelt theory. Luminescence measurements show that with increasing thulium concentration, the strength of the 1470-nm band decreases with respect to that at 1800 nm due to cross relaxation. Emission cross sections were further determined as a function of host composition by using the luminescence data. For a fixed thulium concentration of 1 mol%, samples with % had the highest emission cross sections at 1470 and 1800 nm. Finally, lifetime measurements showed that the luminescence quantum efficiencies of the 1470- and 1800-nm transitions were maximum for host compositions with x=20 and 22 mol%, respectively.
    Journal of Luminescence 01/2006; 116(1-2):79-86. · 2.14 Impact Factor
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    ABSTRACT: The (1−x)TeO2–xPbF2 binary glass system was investigated by differential thermal analysis (DTA) and ultraviolet–visible-near-infrared (UV–VIS-NIR) absorption spectrophotometer. Samples were prepared by melting the mixture of TeO2 and PbF2 in a platinum crucible at 800°C in air. Glass transition and the crystallization temperatures as function of the glass composition were measured by DTA.An exothermic peak of crystallization temperature was observed at about 340±1°C for all three samples. A second peak of peak crystallization temperature was observed at about 400°C for only the sample with 0.15mol PbF2.The mechanism and the activation energy for each crystallization peak were determined from the DTA curves measured with different heating rates between 5 and 20°C/min. The mechanism of the crystallization was found to be surface crystallization for the first exothermic peak for only 0.15mol PbF2 sample; on the other hand, bulk crystallization was found for all samples. Corresponding activation energies are 814, 748, and 387kJ/mol for the samples with 0.10, 0.15 and, 0.25mol PbF2, respectively.The mechanism and the activation energy for the second exothermic peak observed in the sample with 0.15mol PbF2 were found to be bulk crystallization and 415kJ/mol, respectively.The optical band gap, and Urbach energies were calculated from the absorption spectra measured between 300 and 800nm at room temperature. The optical bandgap varies from 2.02 to 1.90eV when the PbF2 content increases from 0.10 to 0.25mol in the glass matrix.
    Journal of Alloys and Compounds 01/2006; 419(1):294-298. · 2.73 Impact Factor
  • PROCEEDINGS-SPIE THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING. 01/2004;
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    ABSTRACT: Tm3+-doped glasses have two emission bands that peak around 1470 nm and 1800 nm in the near infrared, making them potentially important in the development of fiber-optic amplifiers and fiber lasers. The relative strength and the quantum efficiency of these bands depend on the glass composition as well as the active ion concentration. In this study, we have investigated the variation of the luminescence strengths as a function of glass composition and Tm3+ ion concentration in a new type of Tm3+-doped tellurite glass. In the experiments, two sets of samples with the host composition (1-x)TeO2-(x)PbF2 were prepared. In the first set, the active ion concentration was constant (1 mol. % Tm3+) and x=10, 15, 17, 20, 22 and 25 mol. %. The second set had samples with x=10 mol. % and the active ion concentration varied from 0.2 to 1 mol. %. In the experiments, absorption measurements were first made to determine the spontaneous emission probabilities of the 4f-4f transitions of the Tm3+ ions. The calculations were made by using the Judd-Ofelt theory. The samples were then excited with a 785-nm diode to measure the relative emission strengths of the 1470-nm and 1800-nm bands. Our results show that as the Tm3+ ion concentration increases from 0.2 mol. % to 1 mol. %, the ratio of the 1470-nm intensity decreases from 0.98 to 0.18 relative to that of the 1800-nm band.
    Photonics Europe; 01/2004
  • I Kabalci, G Ozen, A Kurt, A Sennaroglu
    MRS Proceedings. 01/2004; 829(1).

Publication Stats

7 Citations
4.87 Total Impact Points

Institutions

  • 2011
    • Harran University
      Charan, Şanlıurfa, Turkey
  • 2006
    • Istanbul Technical University
      • Department of Metallurgical and Materials Engineering
      İstanbul, Istanbul, Turkey
  • 2004
    • The International Society for Optics and Photonics
      International Falls, Minnesota, United States